remove markup in strings marked for translation

Use attributes instead to make translation easier. The markup
tags should not be in the translation strings.

Change-Id: I2c22925b79f67675dcfc9e650adf6f59a1a2ba45
Reviewed-by: Alexandre Lision <alexandre.lision@savoirfairelinux.com>
diff --git a/ui/accountaudiotab.ui b/ui/accountaudiotab.ui
index 08fc350..2099946 100644
--- a/ui/accountaudiotab.ui
+++ b/ui/accountaudiotab.ui
@@ -74,8 +74,10 @@
               <object class="GtkLabel" id="label_codecs">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
-                <property name="label" translatable="yes">&lt;b&gt;Codecs&lt;/b&gt;</property>
-                <property name="use_markup">True</property>
+                <property name="label" translatable="yes">Codecs</property>
+                <attributes>
+                  <attribute name="weight" value="bold"/>
+                </attributes>
               </object>
             </child>
           </object>